//----------------------------
// http://webabcd.cnblogs.com/
//----------------------------

function yy_sl_copyTextToHiddenField(source, destination)
{
/// <summary>将Label控件的的值赋给隐藏控件</summary>

document.getElementById(destination).value = document.getElementById(source).innerHTML;
}

using System;
using System.Collections.Generic;
using System.Text;
using System.Web.UI.WebControls;
using System.Web.UI;
[assembly: System.Web.UI.WebResource("YYControls.SmartLabel.Resources.ScriptLibrary.js", "text/javascript")]
namespace YYControls
{
/**//// <summary>
/// SmartLabel类，继承自DropDownList
/// </summary>
    [ToolboxData(@"<{0}:SmartLabel runat='server'></{0}:SmartLabel>")]
[System.Drawing.ToolboxBitmap(typeof(YYControls.Resources.Icon), "SmartLabel.bmp")]
public partial class SmartLabel : Label
{
/**//// <summary>
/// 构造函数
/// </summary>
        public SmartLabel()
{
}
/**//// <summary>
/// OnPreRender
/// </summary>
/// <param name="e">e</param>
        protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);
// 实现Label控件的回发(Postback)功能
            ImplementPostback();
}
}
}

using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Web.UI;
namespace YYControls
{
/**//// <summary>
/// SmartLabel类的属性部分
/// </summary>
    public partial class SmartLabel
{
/**//// <summary>
/// 使Label支持回发(Postback)的隐藏控件的后缀名
/// </summary>
        [
Browsable(true),
Description("使Label支持回发(Postback)的隐藏控件的后缀名"),
Category("扩展"),
DefaultValue("EnablePostback")
]
public virtual string HiddenFieldPostfix
{
get
{
string s = (string)ViewState["HiddenFieldPostfix"];
return (s == null) ? "EnablePostback" : s;
}
set
{
ViewState["HiddenFieldPostfix"] = value;
}
}
/**//// <summary>
/// 是否启用Label控件的回发(Postback)
/// </summary>
        [
Browsable(true),
Description("是否启用Label控件的回发(Postback)"),
Category("扩展"),
DefaultValue(false)
]
public virtual bool EnablePostback
{
get
{
bool? b = (bool?)ViewState["EnablePostback"];
return (b == null) ? false : (bool)b;
}
set
{
ViewState["EnablePostback"] = value;
}
}
}
}